Gfi Tripping win unit attempts to go into defrost mode

This unit has work perfectly until recently. Unit will cool down and freeze up. When it attempts to go into defrost mode, it trips the GFI (Working Fine).

Just recently replaced the defrost timer and it did not correct the problem. Today I replaced the defrost thermostat and still have the problem. Checked the continuity on the heating element and appears to be OK.

Any advice would be appreciated

— Begin quote from seagullah;833554

This unit has work perfectly until recently. Unit will cool down and freeze up. When it attempts to go into defrost mode, it trips the GFI (Working Fine).

Just recently replaced the defrost timer and it did not correct the problem. Today I replaced the defrost thermostat and still have the problem. Checked the continuity on the heating element and appears to be OK.

Any advice would be appreciated

— End quote

Could a possibly be a realay somewhere in the unit. Model FRS24WRA